论文标题
RedShift 10.957的GN-Z11作为发光星系的证据
Evidence for GN-z11 as a luminous galaxy at redshift 10.957
论文作者
论文摘要
基于哈勃空间望远镜（HST）成像数据，将Gn-Z11在红移Z> 10处被光度法选择为红移Z> 10的发光星系候选者。随访HST HST近红外的晶状体观察结果检测到连续断裂，被解释为对应于Z = 11.09（+0.08-0.12）的Ly-Alpha断裂。但是，其准确的红移仍然不清楚。在这里，我们报告了GN-Z11的三个紫外线（UV）发射线的可能检测，可以将其解释为[C III] 1907，C III] 1909 Doublet和O III] 1666 Z = 10.957 +/- 0.001（当宇宙仅为其当前年龄的〜420 Myr，或〜420 Myr时）。这与以前的Grism观测值的红移一致，该观察结果支持GN-Z11是迄今已知的最遥远的星系。它的紫外线可能起源于在低红移下很少见的致密离子气体，其强[C III]和C III]的发射部分是由于活性银河系核（AGN）或增强的碳丰度所致。 GN-Z11是发光的，年轻的，但中等程度的大量，这意味着过去迅速积累了恒星质量。未来的设施将能够在更高的红移处找到此类星系的祖细胞，并在重新离子开始时探测宇宙时代。
GN-z11 was photometrically selected as a luminous star-forming galaxy candidate at redshift z > 10 based on Hubble Space Telescope (HST) imaging data. Follow-up HST near-infrared grism observations detected a continuum break that was explained as the Ly-alpha break corresponding to z = 11.09 (+0.08-0.12). However, its accurate redshift remained unclear. Here we report a probable detection of three ultraviolet (UV) emission lines from GN-z11, which can be interpreted as the [C III] 1907, C III] 1909 doublet and O III] 1666 at z = 10.957+/-0.001 (when the Universe was only ~420 Myr old, or ~3% of its current age). This is consistent with the redshift of the previous grism observations, supporting GN-z11 as the most distant galaxy known to date. Its UV lines likely originate from dense ionized gas that is rarely seen at low redshifts, and its strong [C III] and C III] emission is partly due to an active galactic nucleus (AGN) or enhanced carbon abundance. GN-z11 is luminous and young, yet moderately massive, implying a rapid build-up of stellar mass in the past. Future facilities will be able to find the progenitors of such galaxies at higher redshift and probe the cosmic epoch in the beginning of re-ionization.
